Income Taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - Deferred tax asset valuation allowance - USD ($) $ in Millions	12 Months Ended
	Jul. 26, 2025	Jul. 27, 2024	Jul. 29, 2023
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of fiscal year	$ 1,024	$ 754	$ 834
Additions	33	148	35
Additions from Splunk	0	147	0
Deductions	(4)	(4)	(18)
Write-offs	(145)	(20)	(93)
Foreign exchange and other	2	(1)	(4)
Balance at end of fiscal year	$ 910	$ 1,024	$ 754